Microwave sensor with adjustable sampling frequency based on environmental conditions
US5684458A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 26, 1996 |
| Grant date | Nov 4, 1997 |
| Priority date | — |
| Expiry date | Feb 26, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/56
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus and method for varying the sampling frequency of a Doppler effect device, based on environmental conditions, is described comprising: (i) a transmitter for transmitting energy into a protected area; (ii) a receiver for receiving energy reflected from the protected area and for transforming the received energy into a motion detection signal which is proportional to any Doppler energy received by the receiver; (iii) a processor responsive to the motion detection and operative to automatically modify the sampling frequency when the motion detection signal exceeds a predetermined threshold value and the apparatus has not been operated at each of a plurality of sampling frequencies; and (iv) an alarm coupled to the processor activated when the motion detection signal exceeds the predetermined threshold value and the apparatus has been operated at each of the plurality of sampling frequencies. The device is useful in minimizing unstable Doppler effect channels in both single and dual technology devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.